A5083020249- Advanced Photocatalysis Techniques
- Indoor and Outdoor Localization Technologies
- Semiconductor materials and devices
- Electrocatalysts for Energy Conversion
- Silicon Nanostructures and Photoluminescence
- Copper-based nanomaterials and applications
- Quantum Dots Synthesis And Properties
- Electronic and Structural Properties of Oxides
- ZnO doping and properties
- Nanowire Synthesis and Applications
- Lepidoptera: Biology and Taxonomy
- Perovskite Materials and Applications
- Ga2O3 and related materials
- Chalcogenide Semiconductor Thin Films
- Gas Sensing Nanomaterials and Sensors
- GaN-based semiconductor devices and materials
- Insect Pheromone Research and Control
- Diamond and Carbon-based Materials Research
- Semiconductor materials and interfaces
- Target Tracking and Data Fusion in Sensor Networks
- CO2 Reduction Techniques and Catalysts
- 2D Materials and Applications
- Entomological Studies and Ecology
- Silicon and Solar Cell Technologies
- MXene and MAX Phase Materials
Schott (Germany)
2012-2025
Technical University of Munich
2012-2025
Bayer (Germany)
2024
CeNTech
2023
University of KwaZulu-Natal
2022
University of Mpumalanga
2022
Caterpillar (United States)
2022
Max Planck Computing and Data Facility
2019-2021
Lawrence Berkeley National Laboratory
2008-2020
Joint Center for Artificial Photosynthesis
2012-2020
Laboratory demonstrations of spontaneous photoelectrochemical solar water splitting cells are reviewed. Reported solar-to-hydrogen conversion efficiencies as high 18%. operational lifetimes relatively short, with few exceeding one week.
Using an ultrathin (∼ 15 nm in thickness) molybdenum oxide (MoOx, x < 3) layer as a transparent hole selective contact to n-type silicon, we demonstrate room-temperature processed oxide/silicon solar cell with power conversion efficiency of 14.3%. While MoOx is commonly considered be semiconductor band gap 3.3 eV, from X-ray photoelectron spectroscopy show that may behave high workfunction metal low density states at the Fermi level originating tail oxygen vacancy derived defect located...
A comprehensive approach to understanding the electronic structure of monoclinic scheelite bismuth vanadate (ms-BiVO4), including both valence band (VB) and conduction (CB) orbital character, is presented. Density functional theory (DFT) calculations are directly compared experimental data obtained via X-ray absorption spectroscopy (XAS), emission spectroscopy, resonant inelastic (RIXS), photoelectron provide a complete portrait total partial density states (DOS) near bandgap. DFT presented...
Preorganization in a covalent organic framework leads to the generation of more conductive mixed-valence state upon doping.
Hybrid organic-inorganic halide perovskite based semiconductor materials are attractive for use in a wide range of optoelectronic devices because they combine the advantages suitable attributes and simultaneously low-cost solution processability. Here, we present two-step low-pressure vapor-assisted process to grow high quality homogeneous CH3NH3PbI3-xBrx films over full band gap 1.6-2.3 eV. Photoluminescence light-in versus light-out characterization techniques used provide new insights...
Abstract Artificial photosynthesis relies on the availability of semiconductors that are chemically stable and can efficiently capture solar energy. Although metal oxide have been investigated for their promise to resist oxidative attack, materials in this class suffer from chemical photochemical instability. Here we present a methodology evaluating corrosion mechanisms apply it bismuth vanadate, state-of-the-art photoanode. Analysis changing morphology composition under water splitting...
Photoelectrochemical water splitting is a promising approach for renewable production of hydrogen from solar energy and requires interfacing advanced water-splitting catalysts with semiconductors. Understanding the mechanism function such electrocatalysts at atomic scale under realistic working conditions challenging, yet important, task advancing efficient stable function. This particularly true case oxygen evolution and, here, we study highly active Co3O4/Co(OH)2 biphasic electrocatalyst...
Monoclinic scheelite bismuth vanadate (m-BiVO4) is a promising semiconductor photoanode for photoelectrochemical (PEC) water splitting. Despite considerable recent progress in achieving improved photocurrents and photovoltages, there remain open questions about the basic optoelectronic properties of this material. Indeed, disagreement nature its fundamental bandgap, with theoretical predictions some experimental observations pointing to an indirect bandgap other studies direct bandgap....
Arrays of graphene solution-gated field-effect transistors are fabricated for the detection electrical activity electrogenic cells. Cardiomyocyte-like cells cultured on transistor arrays and their action potentials detected by underlying transistors. The analysis recorded cell signals electronic noise confirm that surpass state-of-the-art devices bioelectronic applications. Detailed facts importance to specialist readers published as "Supporting Information". Such documents peer-reviewed,...
This article reports the first prospective life-cycle net energy assessment of a gigawatt-scale photoelectrochemical (PEC) hydrogen production facility.
Plasma-enhanced atomic layer deposition of cobalt oxide onto nanotextured p+n-Si devices enables efficient photoelectrochemical water oxidation and effective protection Si from corrosion at high pH (pH 13.6). A photocurrent density 17 mA/cm2 1.23 V vs RHE, saturation current 30 mA/cm2, photovoltage greater than 600 mV were achieved under simulated solar illumination. Sustained was observed with no detectable degradation after 24 h. Enhanced performance the structure, compared to planar Si,...
Abstract While self-healing is considered a promising strategy to achieve long-term stability for oxygen evolution reaction (OER) catalysts, this remains challenge OER catalysts working in highly alkaline conditions. The of the OER-active nickel iron layered double hydroxides (NiFe-LDH) has not been successful due irreversible leaching Fe catalytic centers. Here, we investigate introduction cobalt (Co) into NiFe-LDH as promoter situ redeposition. An active borate-intercalated NiCoFe-LDH...
Abstract Renewable fuel generation is essential for a low carbon footprint economy. Thus, over the last five decades, significant effort has been dedicated towards increasing performance of solar fuels generating devices. Specifically, to hydrogen efficiency photoelectrochemical cells progressed steadily its fundamental limit, and faradaic valuable products in CO 2 reduction systems increased dramatically. However, there are still numerous scientific engineering challenges that must be...
Hybrid perovskite semiconductor materials are predicted to lock chirality into place and encode asymmetry their electronic states, while softness of crystal lattice accommodates strain maintain high quality with low defect densities, necessary for luminescence yields. We report photoluminescence quantum efficiencies as 39% degrees circularly polarized up 52%, at room temperature, in the chiral layered hybrid lead-halide perovskites (R/S/Rac)-3BrMBA 2 PbI 4 [3BrMBA =...
Colloidal self-assembly allows rational design of structures on the micrometer and submicrometer scale. One architecture that can generate complete three-dimensional photonic bandgaps is diamond cubic lattice, which has remained difficult to realize at length scales comparable with wavelength visible or ultraviolet light. In this work, we demonstrate crystals self-assembled from DNA origami act as precisely programmable patchy colloids. Our DNA-based nanoscale tetrapods crystallize into a...
Geometric dilution of precision (GDOP) has been widely used as an accuracy metric for navigation and tracking systems. Since high in a positioning system requires both accurate measurement the range good geometric relationship between mobile device measuring points, analysis GDOP is essential feature determining performance system. In this paper, we perform to obtain concise analytical expressions number scenarios, which are generally applicable geometries where surrounded by base stations....
Photoelectrochemical (PEC) water splitting has received growing attention as a potential pathway to replace fossil fuels and produce clean, renewable, sustainable source of fuel. To achieve overall the associated production solar fuels, complex devices are needed efficiently capture light from sun, separate photogenerated charges, catalyze reduction oxidation reactions. date, highest performing rely on multi-component systems, which introduce interfaces that can be with further performance...
Bismuth vanadate (BiVO4) has attracted increasing attention as a photoanode for photoelectrochemical (PEC) water splitting. It band gap in the visible light range (2.4–2.5 eV) and valence position suitable driving oxidation under illumination. While number of methods have been used to make BiVO4 photoanodes, scalable thin film deposition remained relatively underexplored. Here, we report synthesis films by reactive sputtering. The use separate Bi V sputtering targets allows control Bi/V...
Abstract Formation of planar heterojunction perovskite solar cells exhibiting both high efficiency and stability under continuous operation remains a challenge. Here, we show this can be achieved by using defective TiO 2 thin film as the electron transport layer. layers with native defects are deposited beam evaporation in an oxygen-deficient environment. Deep-level hole traps introduced contribute to photoconductive gain reduced photocatalytic activity. The photoconductivity layer leads...